AFGetImageOperation in OpenFlow - iphone

Question

What's the correct way to implement AFGetImageOperation for OpenFlow.
AFGetImageOperation *getImageOperation = [[AFGetImageOperation alloc] initWithIndex:i viewController:self];
getImageOperation.imageURL = [NSURL URLWithString:aImage.imageURL];
[loadImagesOperationQueue addOperation:getImageOperation];
[getImageOperation release];
aImage.imageURL has the requested image URL but unsure where the retrieved image is stored?
Thanks

Answer 1

Images are not cached. It fetches the image again and again.
You can cache the image using following methods..
-(NSString *) md5String
{
NSString *md5 = [Utilities md5String:[imageURL absoluteString]];
return md5;
}
-(void) storeImage:(UIImage *)image AtPath:(NSString *)path
{
NSFileManager *manager = [NSFileManager defaultManager];
if([manager fileExistsAtPath:path])
{
[manager removeItemAtPath:path error:nil];
}
NSData *data = UIImagePNGRepresentation(image);
[data writeToFile:path atomically:NO];
}
//TODO: //We need to cehck the expiry date as well..
//-(UIImage *) imageFromPath:(NSString *)path Expiry:()
-(UIImage *) loadImageFromPath:(NSString *)path
{
UIImage *image = nil;
NSFileManager *manager = [NSFileManager defaultManager];
if([manager fileExistsAtPath:path])
{
image = [[[UIImage alloc] initWithContentsOfFile:path] autorelease];
}
return image;
}
-(NSString *) cachedImagePath
{
NSString *md5 = [self md5String];
NSString *cachedFilePath = [[Utilities applicationCacheDirectory] stringByAppendingPathComponent:md5];
return cachedFilePath;
}
- (void)main {
NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
if (imageURL) {
UIImage *photo = nil;
NSString *cachedFilePath = [self cachedImagePath];
UIImage *image = [self loadImageFromPath:cachedFilePath];
if(image)
{
photo = image;
}
else
{
NSData *photoData = [NSData dataWithContentsOfURL:imageURL];
photo = [UIImage imageWithData:photoData];
[self storeImage:photo AtPath:cachedFilePath];
}
// Create a UIImage from the imageURL.
if (photo) {
[mainViewController performSelectorOnMainThread:#selector(imageDidLoad:)
withObject:[NSArray arrayWithObjects:photo, [NSNumber numberWithInt:photoIndex], nil]
waitUntilDone:YES];
}
} else {
// Load an image named photoIndex.jpg from our Resources.
NSString *imageName = [[NSString alloc] initWithFormat:#"place_holder_bg.png", photoIndex];
UIImage *theImage = [UIImage imageNamed:imageName];
if (theImage) {
[mainViewController performSelectorOnMainThread:#selector(imageDidLoad:)
withObject:[NSArray arrayWithObjects:theImage, [NSNumber numberWithInt:photoIndex], nil]
waitUntilDone:YES];
} else
NSLog(#"Unable to find sample image: %#", imageName);
[imageName release];
}
[pool release];
}